Rotary blower or pump.



0. SIEMEN AND'W. SiEOKE.

V ROTARY BLOWER 0B PUMP. Mmsmou Pimp y, I. ma. acumen pus. 1. m1.

1,329,363, Patented Nov. 18, 1919. V 2 SHEET$-SNEET I:

f g? I F219. 2

0. SIEMEN AND W. SIECKE.

ROTARY'BLOWER 0R PUMP.

APPLICATION FILED APR, 1, m3. nzuzww AUG- 1. Hill.

Patented NW. 18, B119.

OTTO SIEMEN, F NONNENDAMM, NEAR BERLIN, AND

wnmmn cinema, or 1mm,

GERMANY, ASSIGNORS TO SIE MENS-SCHUCKEBTWERKE, G- M.. B. H OF BE BLIN,

GERMANY, A coax-oanrzon'or GERMANY.

no'rnnr BLOWER on PUMP.

Specification of Letters Patent.

Application flied April 1, 1913, Serial No. 758,197. Renewed August 7, 1917. Serial No. 184,976.

To all whom it may concern:

Be it. known that we, OTTO SIEMEN and Wnmvna SIEUKE, citizens of the German Em lire, and respectively residing; at Nonnen amm, nearv Berlin; and Berlin, Germany, have invented certain new. and useful Improvements in Rotary Blowers or Bumps, of which the following is a specification.

Our invention relates to rotary blowers or pumps in which a rotating ring of liquid constitutes the packing between the blades of the blade-wheel and the casing andthe inlet and outlettopenings for the medium which is sucked into the blower or pump. In such pumps the blade-wheel is arranged eccentrically in the bore of the pump casing. The water introduced into the casing is driven hy the rapidly? rotating blades and in consequence of .the centrifugal force forms a ring. which fills up thespace betweenthe inner face of the casing and the outside boundary ofthej inlet and outlet According to our invention "the interior periphery of the casing 'is not circular, but ulges: outward on thesuction side and, if

desired, on the discharge side ofthe pump.

We hereby provide-thatthe packin bemore favorable than heretofore, and that iwhenthe speed and the ratio'of the suction and discharge pressures vary, more favorable'osierationisobtained; shows a section througha pump for convey our invention, said section being taken at a rightangle to the shaft of the pump, Fig. 2 shows a section parallel to the shaft ofsaidp Q0 throughfu. pump similar'to Fig. 1 differing from the latter in that the outlet consists of a plurality of valve openin s, Fig. 4 is a side view of the pump shown in Fig. 300mrising also a disk preventing the medium 46 in conveyed from flowing around from ,one. lade to the other; 5 a section through a pump construction having a 1 clearance or overflow passage, Fig. 6 aside view to Fig. Fi 7 a construction of a so pump with two iI etc ,which are dis laced y a proximately 180 and correspon ingly dis aced outlets.

lgeferring to the drawing, a designates ing, air acoording'to tween the suction and discharge si as is e accompanying drawings Figure 1 amp; Fig. 3 a section .the blade-wheel journaledeccentricall%' designates the suction or inlet'openingand 0 the discharge or outlet opening-for the air. f a

d deviates relatively to the bore of the casing d, and

The inside face of' the casin Patented Nov. 1 8 1 ,1

from the circular, as indicate by a-dotted f line, and is' bulged or curved outward on the suctionside and also onv the discharge The bulges enable both the suction side. opening I) and the discharge opening a to be located very near the crown g of the-blade Wheel. A principal advantage thereby obtained is that the distance between the suc tion and discharge openings is increased; Consequently, compression takes/place over a longer distance and the r' between each two stages ofaltch two blades of pressure. V

of the pump-wheel is relativelysmalh The packing is reliable.

consequently considerably more The peculiar formation of the inside *wall of the pump according to our invention;

same is low. This shifting of tlieeccenthe inner periphor the center-of toward the disperipheral speed ishigh and toward the suction side when the however, also causes more uniform condh gwhen the speed oi the. of the ressures-"on the 85 tricity has, however, muchless antioh'oii the suction capacity of the pump when the suc- E tion 0 of the lade wheel and the as compared with when the casing has a circular cross-section and, consequently, the

suction opening must be located low down". or blower aecondihg The improved pump to our invention is consequently less sensitive to changes of speed and of the ratio of pressures at the suction and discharge. sides of the pump.

Owin

outwarf line on the discharge side is obtained, which displacement allows the free section of outlot of the discharge opening to be considerably increased. Furthflr, the uantity of vvater supplied for maintaining lib of liquid is materiallydimimalred because smaller quantities of water are along to the wall of the casing bulging a radial displacement of the water ening is placed very near the casing is bulged through the outlet opening. This is of portance particularly when it is required to roduce a very high vacuum. The outlet opening may be made as desired. It is preferab e to distribute a number of valves], ae'sho-wn in Fig. 8 of the drawing, on the discharge side whichopen, in known manner, ,only when a redetermined pressure obtains, If the ratio of the pressureaexisting on'the suction and ischarge sides is small, the valves located far from the crown will 0 en and allow the medium sucked in to ow through them. When the said ratio is large, however, on y The advantage of this kind of outlet open ing in connection with the herein describedratio. The packing 18 thus caused to adapt itself to the pressure existing for the time inlet and outlet openings of the sucked-in medium are preferabl )I'OYldGd in the end wall of the casing. on they are provided onl in the one end, as shown in Fig. 4, theot er side of the blade-wheel can be covered b a disk (2 for preventing the medium whic is being conveyed flowin around from one blade to the others.

clearance may exist at the crown q of the pump-wheel, the contents of the c earance bei at a high pressure. In order to prevent e compressed medium bein carried over to the suction side and t ereby diminishing the suction space, we may provide in the end wall of the casing a passage in which connects the space at t e crown with the space a of the pump which is at u pressure h er than the initial pressure, as shown in gs. 5 and 6. Particularly when ethe ratio of compression is high the suckedin volume can he kept as large as possible in this arrangement.

It is also possible to combine two pump a in one casing in order to obtain a noble plump. In this case each side of the blade w eel is provided with two in to lots which are displaced from each other by about 180 and two correspondingly dis- 7 placed outlets, such as shown in Fig. 7. In ed into his construction the casing is div'i the valves located near the crown will open.

neaaeee two halves by the blade wheel, each half representing a pumpl system of its own. The work of umping t us will take place within either elf of the casin that is within an angle of In Fig. la, and b, are the suction openings 0, and c, the pressure 0 enin a" are the s aces or enlargements w ich eviatefrom t e dotted line re resenting the circular cross-section. T ese bullges or enlar ements will render it possib e to place t e suction and the ressure openings as far as plosible from one other.

For increasing t e "ratio of compression 0. number of pumps of the kind described may, of course, be connected in series, so that the pressure of the sucked-in medium is raised in stages.

We claim z-- 1. In a rotar blower or pump of the character descri d, the combination of a casing having an inlet openi and an outlet opening, and a blade-whee mounted ecceutricnlly in the casing and adapted when rapidly rotated, to cause liquid flupplied'into the casin to assume the form of a rotating rin in t e casing, the interior periphery o the casing bein bulged or curved outward both on the in at and on the outlet side thereof in a shape deviating froifl the cirn a rota ower or um character described, the oomliination of a casing having an inlet opening and shoutlet 0 ening,.a aide-wheel mounted eccenrapidly rotated, the seam to assume the form of a rotating ring in t e casing}, the interior, periphery o the casing being ulged or curred in a shape deviating from the circular, and a pussa connecting the space at the crown of the h ado-wheel with a space in the casein containing a pressure l her than the initia ressure.

In testimony whereof we have signed-our names to this specification in the 01 two witnesses.

OTTO sin-ME" WERNER S 116 Witnesses:

Harm! Hism, Woumuaa Hans-r,

outward of, the.

trica yin the casing and adapted, when to cause liquid. supplied into 

